Samsung may be doing an Apple. Since it isn't releasing the Galaxy S III at the Mobile World Congress (MWC) show later this month, how about a tweaked version of its current flagship instead?
Enter - maybe - a reference to the Galaxy S II Plus, seemingly keyed into the An3DBenchXL benchmark app by Samsung itself.
All we can see …

They could do it but

.

never mind that

They've already released several SII variants with *stock* clocks of 1.5GHz. And larger screens (4.5" and 4.7").

This whole article reads like it was written by someone who isn't aware there are already about seven bajillion 'Galaxy S II' phones, some very different from others. (My husband's 'Galaxy S II' has more in common, hardware-wise, with my MyTouch 4G Slide than most other 'GSII' variants). Which I suppose is understandable if you're in Europe, where you mostly just get the actual original model. But if you're in NA, it's a rather different story. See:

the story...

My Galaxy S2 already beats/matches most of those specs stock. The US T-Mobile version came with a 4.52" screen, 1.5ghz dual core processor and I'm currently on android 2.3.6 and has HSPA+ so I average 14-19mb/s download and 2-4mb/s upload. Although I didn't make a note of what the article said the bench was, my quadrant score averages 3350 or higher. The other two US carriers have a slower smaller version that closer matches the European/world version. But the Samsung 1.2ghz exynos processor is just as fast as the 1.5ghz snapdragon, so other than screen size they are all the same. I have a feeling the graphic here was falsely created just to make a story unless they are putting an LTE radio in it which would only slow it down and shorten battery life.

there's already...

...an LTE model. The SGH-I727, branded 'Skyrocket' on AT&T and "Galaxy S II LTE" on Rogers in Canada. The Rogers variant is the 'SGH-I727R' but I don't think there's actually any difference beyond the carrier name stamped on the case.